Imitation event (Custom Event)

Yesterday I read professional C #2005. net 3.O, and it implements a custom event. If the current time is less than 30 seconds, the event is triggered. Otherwise, the event is canceled. However, in this example, the button event processing is added, and a form application is used.ProgramI personally feel that his event handling is easy to confuse. At the beginning, I thought he had reversed the event handler and the sender. Later, I thought about it and understood it completely. That is, he thinks that the current event is sent by pressing the button. So he first added an actioncanceleventargs event processing and sending link class, and then called the onaction function to send the event. After the onaction (Action) function is called, because it is a delegate and static, and the delegate adds a corresponding processing function in the busentity class. Therefore, this function is directly transferred to form1_action for execution, so that the event processing process is complete. However, this example involves processing other events and adding other elements, so it seems a bit confusing. Although programming will be more confusing in the future, it will be hard for beginners to understand, as I did not fully understand it when I first saw it. Then I wrote a Custom Event Process in my console, which is clear and contains fewer impurities. I hope to help you. Of course, I am a beginner. Please correct the problem. FirstCodeAnalyze it again.

 

Code

UsingSystem;
UsingSystem. Collections. Generic;
UsingSystem. text;
UsingSystem. componentmodel;

Namespace Eventcreate
{
Class Test
{
Static   Public   Void Main ()
{
Dosomething dosomthing =   New Dosomething ();
Dosomthing. Run ();
}
}

Public Delegate VoidMyeventargshandler (ObjectSender, myeventargs ARGs );

Class Myeventargs: canceleventargs
{
Private   String Message = String. empty;
Public   String Message
{
Get { Return Message ;}
Set {Message = Value ;}
}
Public Myeventargs (): Base ()
{
}
Public Myeventargs ( Bool Cancel)
: Base (Cancel)
{
}
Public Myeventargs ( Bool Cancel, String Message)
: Base (Cancel)
{
This . Message = Message;
}
}

Class Controltimer
{
Public   Event Myeventargshandler secondodd;
Public   Void Onsecondodd ( Object Sender, myeventargs ARGs)
{
If ( Null   ! = Secondodd)
Secondodd (sender, argS );
}
}
Class Dosomething
{
Private Controltimer;
Public Dosomething ()
{
Controltimer =   New Controltimer ();
Controltimer. secondodd + =   New Myeventargshandler (dosomething_oddtimer );
}

Public   Void Run ()
{
Random random =   New Random ();
Myeventargs =   New Myeventargs ();
While ( True )
{
Console. writeline ( " Test the second time " );
Int Time = Random. Next ( 5 );
Console. writeline ( " Sleep time is "   + Time );
System. Threading. thread. Sleep (Time *   1000 );
Controltimer. onsecondodd (controltimer, myeventargs );
If (Console. Readline () =   " Q " )
Break ;
}
}

Private   Void Dosomething_oddtimer ( Object Sender, myeventargs ARGs)
{
Int Second;
Args. Cancel =   ! Issecondodd ( Out Second );
If (ARGs. Cancel)
Args. Message =   " Wasn't the right time, even second! "   + Second +   " S " ;
Else
Args. Message =   " The right time, "   + Second +   " S, odd second " ;
Console. writeline (ARGs. Message );
}

Private   Bool Issecondodd ( Out   Int Second)
{
Datetime now = Datetime. now;
Second = Now. Second;
If (Second %   2   =   1 )
Return   True ;
Return   False ;
}
}
}

 

My dosomething class imitates the processing method of the application class, so it can be seen as a form window executed in the application. It is equivalent to form1. The controltimer class can be regarded as a control, for example, a button. Event processing is executed in the dosomething class. The event sender sends a secondodd event of the controltimer class in the run function because of a sleep time. The event is finally executed in the controltimer class, this class is used for sending and processing in the dosomething class to determine whether the number of seconds in the current time is an odd number.